Add remaining docstrings to complete documentation coverage

Co-authored-by: varun-r-mallya <100590632+varun-r-mallya@users.noreply.github.com>

pythonbpf/decorators.py

@@ -41,6 +41,7 @@ def section(name: str):
         A decorator function that marks the function with the section name
     """
     def wrapper(fn):
+        """Decorator that sets the section name on the function."""
         fn._section = name
         return fn